We review the statistical properties of the main populations of radio sources, as emerging
from radio and millimeter sky surveys. Recent determinations of local luminosity functions …

We collect data at well-sampled frequencies from the radio to the γ-ray range for the
following three complete samples of blazars: the Slew survey, the 1-Jy samples of BL Lacs …

The phenomenology of γ‐ray bright blazars can be accounted for by a sequence in the
source power and intensity of the diffuse radiation field surrounding the relativistic jet …

We elucidate the physical basis for the upper bound on high energy neutrino fluxes implied
by the observed cosmic ray flux. We stress that the bound is valid for neutrinos produced …

Following our previously proposed technique, we have used the recent γ-ray observations of
Mkr421 to place theoretically significant constraints on the magnitude of the intergalactic …

We have observed emission from the nucleus of the closest radio galaxy, Centaurus A, from
the radio to the gamma-ray band. We construct, for the first time, its overall spectral energy …

The flat-spectrum radio quasar PKS 0420-014 has been identified as a variable gamma-ray
source in the 100MeV to 5GeV energy band. We studied the variations of this object in the …

The possibility of γ-ray production in blazars as a result of synchrotron e±pair cascade
initiated by extremely high energy curvature photons in the disc/jet magnetic field is …

PKS 0537–441, a bright γ-ray emitting blazar, was observed at radio, optical, UV and X-ray
frequencies during various EGRET pointings, often quasi-simultaneously. In 1995 the object …

We present a detailed X-ray study of the broad-line radio galaxy 3C 382, observed with the
BeppoSAX satellite in a very bright state. The continuum emission is well modeled with a …